
Sonic Underground
Sonia discovers that the watch she received from her friend is actually a monitoring device for the Robotnik Intelligence Agency.

Sonia discovers that the watch she received from her friend is actually a monitoring device for the Robotnik Intelligence Agency.

A homecoming is interrupted for Sonic, Sonia and Manic when Sleet and Dingo arrive to collect back taxes after returning to their birthplace.

Robotnik announces that he will marry Queen Aleena in a plot to become the king of Mobius.

Sonic, Manic and Sonia find an abandoned baby in an alley and begin to look for the baby's parents. Manic becomes very fond of the child.

Wes Weasley lures Tails, Sonic and all of their friends to a yacht under the guise of a "Hero of the Year" ceremony to thank Sonic.

When Sonic vanishes mysteriously, Tails enlists the help of a bi-plane pilot named William Le' Duc, and Professor Von Schlemmer.

Sonic loses his memory when Robotnik uses a hypnotic flower pollen on him, and tells him he's just an "ordinary" guy.

When an undersea world is threatened by Captain Memo and his lobster sub, Sonic spreads a rumor that Memo plans to attack Robotnik next.

Robotnik lures Sonic into a round-the-planet vehicle race called the Mobius 5000 by threatening to foreclose on a loan to an orphanage.

Robotnik takes over a local amusement park called "Mobiusland" and changes the name to "Robotnikland".

Robotnik shrinks Sonic and Tails with a shrink ray and puts them into his terrarium. Sonic and Tails escape on the back of a gecko, reverse the shrink ray to restore themselves to normal, then use it to shrink Scratch and Grounder, and put them...

Santa Claus has made an announcement - he is retiring and has picked the perfect successor - "Robotnikclaus"! Sonic and his sister resolve to persuade Santa to return and set Christmas straight. When the two track down the Santa who made the announcement, they discover he is just a phony robot and the real Santa Claus is being held prisoner.

The sinister Robotnik blackmails Cyrus, an old friend of Sonic's, by holding his father hostage.

A group of Freedom Fighters is obliterated by a swarm of metallic fly-bots. When Manic goes looking for the insects, he is stung with serum.

A speed enhancing fluid deemed Sonic Tonic is created by Robotnik to make him as fast as Sonic so that he may finally catch him.

Robotnik announces that he will marry Queen Aleena in a plot to become the king of Mobius.

Rumor has it that Queen Aleena's journals are buried in the city of Tashistan. Sonic and his siblings search the city for the scrolls.

Sleet and Dingo plan to collect the taxes owed to Robotnik from the Duke of Velcronia but keep it for themselves.

Sonia discovers that the watch she received from her friend is actually a monitoring device for the Robotnik Intelligence Agency.

A homecoming is interrupted for Sonic, Sonia and Manic when Sleet and Dingo arrive to collect back taxes after returning to their birthplace.