Will J'onn finally learn the truth about his family?
That will be one of the big questions on Supergirl Season 3 Episode 3 as Supergirl, and M'gann join him on a dangerous mission back to where his family was wiped out.
If you watch Supergirl online, you will know that J'onn's family has long been the thing he needed closure for. Considering this is Supergirl, it's not going to be as easy as traveling somewhere for the closure.
Instead, it looks like he's going to face several blasts from the past, and that will likely come back to haunt him. In one of the scenes teased in the trailer, he apparently comes face to face with his father.
Will it be a vision? Will it be real? We have no idea, but it looks like it's going to be a fun installment.
This episode will also give viewers their first glimpse into the Sanvers wedding shower, and that means Helen Slater will be back around as Eliza to support her daughter.
In fact, Eliza is the one who organizes the whole shindig, so we can only imagine how cute it's going to be.
Have a look at the full teaser below and join us in the comments with your thoughts on it.
Supergirl continues Monday on The CW!