These 4 issues made up a storyline titled "Pirate Plunder Panic". Blaze the Cat makes a brief reference to her capture by Dr. Eggman and Dr. Wily. The Wily Egg ended up in the Sol Zone. It's found by Captain Metal, who remodeled it into the Egg O' War and eventually powered it with the Sol Emeralds. He also had a back up of his programming installed, which he made use of when his body was destroyed. Though the Egg O' War was put out of commission by Burning Blaze, it is shown at the end to still be online.
The story is one of the preludes to Worlds Unite and is set after the events of Sonic the Hedgehog #272 despite the release order of both comics. The story has Sonic pursuing Metal Sonic for a Chaos Emeralds. The two end up going from the Cystal Desert Zone to the Burning Ruin Zone due to a recently opening Genesis Portal. Silver the Hedgehog is also present, due to working on closing each portal as they open. With his help, Sonic retrieves the Emerald and returns to this home. Silver and Metal Sonic find themselves going through different portals, causing them to end up in unknown dimensions. The story ends with Dr. Eggman being unable to keep in contact with the dimension lost Metal Sonic, while unaware that a possessedOrbot is secretly working with Zavok of the Deadly Six.
These 4 issues made up a storyline titled "The Silver Age". Despite being published after Worlds Unite, "TSA" is a prelude to "Into the Unknown" (Available in the Free Comic Book Day issue of 2015). The story sets up Silver's task to close the Genesis Portals and his encounter with Professor Von Schlemmer.
This issue reveals that Sonic's rescue of the Locky, and retrieval of the Master Emerald in Part 1 of WU was undone following the crossover, as Knuckle must rescue the same Locky and retrieve the same Emerald Shard. Afterwards, Amy mentions that the rescued Locky to have an unexplained sense of deja vu.