Items

There are some props, items and machines that were shown in the adventure, this lists them

Time Machine
In episode 9 Time thingy, Tails makes a time machine that could bring people into the past and future and could bring people from other dimensions, this is its first and probibly last apperance

Plasma Cannon
In episode 5, tails makes a plasma cannon that uses a chaos emerald to power it, during the video tails shows sonic of him working on a prototype, it misfires, tails assumes it broke down, then a beam of energy shoots out, knocking tails aside. this is, like the time machine, first and probibly last apperance.

Gamma E-102
In episode 10, tails rebuilds gamma from the end of gammas story in sonic adventure, and is the series first parter, the second part, episode 10.5 gamma is shown destroyed and is rebuild and reprogrammed back to eggman, during the episode, knuckles is shown battiling gamma and destroying him.

The "Soul gun"
In episode 13, where sonic dies, tails cant cope with it and spends weeks to 2 years working on a gun that could put souls into other people, Sonic is tecnicly alive, or otherwise the gun wont work, to tails puts the soul of sonic and puts it into another dead sonic, therefore bringing back sonic in a new body