Kel writes...

So I've recently been doing a full series rewatch of Young Justice, and I noticed in S3E7 when Vandal Savage gives Cassandra the diadem that controls Warworld that Mongul is shown soon after to still be frozen in a stasis cell as we last left him two years earlier in S2E18, however he's in a different pose and noticeably missing the diadem, which he was still wearing when Black and Green Beetle imprisoned him before.

Obviously this means that at some point or another between those two episodes, Vandal or someone else that had access to Warworld had to have freed Mongul, taken the diadem off of his head, and then reimprisoned him. Considering how freakishly powerful Mongul is (especially since the YJ version of him, much like the Warworld itself, seems to be more based on his original Pre-Crisis rendition in the comics who was stronger even than Superman), how was that even accomplished?