EPISODES

Here are summaries of the episodes in Sonic Underground in which Knuckles made an appearance. In an acknowledgement to the Archie comics, Athair also appeared in Sonic Underground.

Episode #16: Friend or Foe? - Knuckles debut
Episode #24: Flying Fortress - Athair debut
Episode #25: No Hedgehog is an Island
Episode #26: New Echidna in Town